Add AI generated tests for ConfigDBManager #3899

Job	Run time
catalyst	2m 50s
pod-lib-lint (ios, FirebaseRemoteConfig.podspec, macos-14, Xcode_15.3, --allow-warnings --skip-te...	1m 37s
remoteconfig (iOS)	9m 50s
pod-lib-lint (ios, FirebaseRemoteConfig.podspec, macos-15, Xcode_16.1, --allow-warnings)	18m 53s
quickstart	7m 45s
pod-lib-lint (tvos, FirebaseRemoteConfig.podspec, macos-14, Xcode_15.3, --allow-warnings --skip-t...	1m 38s
sample-build-test	2m 0s
pod-lib-lint (tvos, FirebaseRemoteConfig.podspec, macos-15, Xcode_16.1, --allow-warnings)	5m 50s
pod-lib-lint (macos --skip-tests, FirebaseRemoteConfig.podspec, macos-14, Xcode_15.3, --allow-war...	1m 45s
pod-lib-lint (macos --skip-tests, FirebaseRemoteConfig.podspec, macos-15, Xcode_16.1, --allow-war...	2m 34s
remoteconfig-cron-only	0s
	54m 42s

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